Pedigree chart of Japanese emperors https://en.wikipedia.org/wiki/Emperor_of_Japan

JapaneseEmperors.dot

digraph JapaneseEmperors {
        1   [label="神武天皇"]
        2   [label="綏靖天皇"]
        3   [label="安寧天皇"]
        4   [label="懿徳天皇"]
        5   [label="孝昭天皇"]
        6   [label="孝安天皇"]
        7   [label="孝霊天皇"]
        8   [label="孝元天皇"]
        9   [label="開化天皇"]
        10  [label="崇神天皇"]
        11  [label="垂仁天皇"]
        12  [label="景行天皇"]
        13  [label="成務天皇"]
        14  [label="仲哀天皇"]
        15  [label="応神天皇"]
        16  [label="仁徳天皇"]
        17  [label="履中天皇"]
        18  [label="反正天皇"]
        19  [label="允恭天皇"]
        20  [label="安康天皇"]
        21  [label="雄略天皇"]
        22  [label="清寧天皇"]
        23  [label="顕宗天皇"]
        24  [label="仁賢天皇"]
        25  [label="武烈天皇"]
        26  [label="継体天皇"]
        27  [label="安閑天皇"]
        28  [label="宣化天皇"]
        29  [label="欽明天皇"]
        30  [label="敏達天皇"]
        31  [label="用明天皇"]
        32  [label="崇峻天皇"]
        33  [label="推古天皇"]
        34  [label="舒明天皇"]
        35  [label="皇極天皇"]
        36  [label="孝徳天皇"]
        37  [label="斉明天皇"]
        38  [label="天智天皇"]
        39  [label="弘文天皇"]
        40  [label="天武天皇"]
        41  [label="持統天皇"]
        42  [label="文武天皇"]
        43  [label="元明天皇"]
        44  [label="元正天皇"]
        45  [label="聖武天皇"]
        "46_48"  [label="46孝謙天皇(48称徳天皇)"]
        47  [label="淳仁天皇"]
        49  [label="光仁天皇"]
        50  [label="桓武天皇"]
        51  [label="平城天皇"]
        52  [label="嵯峨天皇"]
        53  [label="淳和天皇"]
        54  [label="仁明天皇"]
        55  [label="文徳天皇"]
        56  [label="清和天皇"]
        57  [label="陽成天皇"]
        58  [label="光孝天皇"]
        59  [label="宇多天皇"]
        60  [label="醍醐天皇"]
        61  [label="朱雀天皇"]
        62  [label="村上天皇"]
        63  [label="冷泉天皇"]
        64  [label="円融天皇"]
        65  [label="花山天皇"]
        66  [label="一条天皇"]
        67  [label="三条天皇"]
        68  [label="後一条天皇"]
        69  [label="後朱雀天皇"]
        70  [label="後冷泉天皇"]
        71  [label="後三条天皇"]
        72  [label="白河天皇"]
        73  [label="堀河天皇"]
        74  [label="鳥羽天皇"]
        75  [label="崇徳天皇"]
        76  [label="近衛天皇"]
        77  [label="後白河天皇"]
        78  [label="二条天皇"]
        79  [label="六条天皇"]
        80  [label="高倉天皇"]
        81  [label="安徳天皇"]
        82  [label="後鳥羽天皇"]
        83  [label="土御門天皇"]
        84  [label="順徳天皇"]
        85  [label="仲恭天皇"]
        86  [label="後堀河天皇"]
        87  [label="四条天皇"]
        88  [label="後嵯峨天皇"]
        89  [label="後深草天皇"]
        90  [label="亀山天皇"]
        91  [label="後宇多天皇"]
        92  [label="伏見天皇"]
        93  [label="後伏見天皇"]
        94  [label="後二条天皇"]
        95  [label="花園天皇"]
        96  [label="後醍醐天皇"]
        97  [label="後村上天皇"]
        98  [label="長慶天皇"]
        99  [label="後亀山天皇"]
        N1  [label="光厳天皇"]
        N2  [label="光明天皇"]
        N3  [label="崇光天皇"]
        N4  [label="後光厳天皇"]
        N5  [label="後円融天皇"]
        100 [label="後小松天皇"]
        101 [label="称光天皇"]
        102 [label="後花園天皇"]
        103 [label="後土御門天皇"]
        104 [label="後柏原天皇"]
        105 [label="後奈良天皇"]
        106 [label="正親町天皇"]
        107 [label="後陽成天皇"]
        108 [label="後水尾天皇"]
        109 [label="明正天皇"]
        110 [label="後光明天皇"]
        111 [label="後西天皇"]
        112 [label="112霊元天皇"]
        113 [label="113東山天皇"]
        114 [label="中御門天皇"]
        115 [label="桜町天皇"]
        116 [label="桃園天皇"]
        117 [label="後桜町天皇"]
        118 [label="後桃園天皇"]
        119 [label="光格天皇"]
        120 [label="仁孝天皇"]
        121 [label="孝明天皇"]
        122 [label="明治天皇"]
        123 [label="大正天皇"]
        124 [label="昭和天皇"]
        125 [label="今上天皇"]
        

        
        124 -> 125
        123 -> 124
        122 -> 123
        121 -> 122
        120 -> 121
        119 -> 120
        "(典仁親王)" -> 119
        "(閑院宮直仁親王)" -> "(典仁親王)"
        113 -> 114
        113 -> "(閑院宮直仁親王)"
        114 -> 115
        115 -> 117
        115 -> 116
        116 -> 118
        112 -> 113
        108 -> 109
        108 -> 110
        108 -> 111
        108 -> 112
        107 -> 108
        "(誠仁親王)" -> 107
        106 -> "(誠仁親王)"
        105 -> 106
        104 -> 105
        103 -> 104
        102 -> 103
        "(貞成親王)" -> 102
        "(栄仁親王)" -> "(貞成親王)"
        N3 -> "(栄仁親王)"
        N1 -> N3
        N1 -> N4
        N4 -> N5
        N5 -> 100
        100 -> 101
        93 -> N1
        93 -> N2
        92 -> 93
        92 -> 95
        89 -> 92
        88 -> 89
        88 -> 90
        90 -> 91
        91 -> 94
        91 -> 96

        98 -> 99
        97 -> 98
        96 -> 97

        77 -> 78
        77 -> 80
        78 -> 79
        80 -> 81
        80 -> "(守貞親王)"
        80 -> 82
        82 -> 83
        82 -> 84
        83 -> 88
        84 -> 85
        86 -> 87
        "(守貞親王)" ->86

        74 -> 75
        74 -> 76
        74 -> 77
        71 -> 72 -> 73 -> 74

        69 -> 70
        69 -> 71
        66 -> 68
        66 -> 69
        64 -> 66
        62 -> 63
        62 -> 64
        63 -> 65
        63 -> 67
        60 -> 61
        60 -> 62

        58 -> 59 -> 60
        55 -> 56 -> 57
        54 ->55
        54 -> 58

        52 -> 54
        50 -> 51
        50 -> 52
        50 -> 53

        38 -> 41
        38 -> 43
        38 -> 39
        38 -> "(志貴皇子)"
        "(志貴皇子)" -> 49 -> 50

        40 -> "(草壁皇子)"
        "(草壁皇子)" -> 42
        "(草壁皇子)" -> 44
        42 -> 45
        45 -> "46_48"
        40 -> "(舎人親王)"
        "(舎人親王)" -> 47

        34 -> 38
        34 -> 40

        "(茅渟王)" -> 35
        "(茅渟王)" -> 36
        "(茅渟王)" -> 37
        "(押坂彦人大兄皇子)" -> "(茅渟王)"
        "(押坂彦人大兄皇子)" -> 34
        30 -> "(押坂彦人大兄皇子)"
        29 -> 30
        29 -> 31
        29 -> 32
        29 -> 33

        26 -> 29
        26 -> 27
        26 -> 28

        15 -> "(若野毛二俣王)" -> "(大郎子)" -> "(乎非王)" -> "(彦主人王)" -> 26
        24 -> 25
        15 -> 16
        16 -> 17
        16 -> 18
        16 -> 19
        19 -> 20
        19 -> 21
        21 -> 22

        17 -> "(市辺押磐皇子)"
        "(市辺押磐皇子)" -> 23
        "(市辺押磐皇子)" -> 24

        12 -> 13
        12 -> "(日本武尊)" -> 14 -> 15
        1 -> 2 -> 3 -> 4 -> 5 -> 6 -> 7 -> 8 -> 9 -> 10 -> 11 -> 12
}